Browser.display.auto quality min font size
From MozillaZine Knowledge Base
With the move to the Cairo graphics backend, Mozilla’s text rendering code has changed significantly. Among the changes are support for advanced ligatures and smarter kerning. As these features are more computationally intensive than previous text rendering, they are only used at larger font sizes (where the quality difference is more noticeable), or when the text is affected by the CSS property
This preference controls the minimum font size at which the high-quality rendering is used. Text below this size uses the high-speed path, and text at and above this size uses the high-quality path.
Possible values and their effects
A non-negative integer, specifying device pixels. Text rendered at this size or larger is optimized for display quality rather than display speed. Default is 20.
To use the highest quality display and legibility settings for all rendered text, set this preference to 0. Conversely, setting this preference to a very high number will cause Mozilla to use the fastest rendering methods for all text.
First checked in
Has an effect in